1. Defi ne and implement a class Pen that has an instance of Ball as one of its members. Provide several members for the class Pen , such as the data member color and methods isEmpty and write . 2....

1. Defi ne and implement a class Pen that has an instance of Ball as one of its members. Provide several members for the class Pen , such as the data member color and methods isEmpty and write .

2. Consider the following classes:

• LandVehicle represents a vehicle that travels on land. Its public methods include wheelCount and speed .

• MotorizedLandVehicle represents a land vehicle that has a motor. Its public methods include engineCapacity and fuelType .

a. Which of the methods mentioned previously can the implementation of speed invoke?

b. Which of the methods mentioned previously can the implementation of engineCapacity invoke?